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  2. Is It Time for a Furnace Upgrade? 10 Warning Signs to ... - AOL

    www.aol.com/time-furnace-upgrade-10-warning...

    Depending on the problem and the age of the furnace, it may be more cost-effective to invest in a replacement furnace instead of making expensive repairs to an old system. 10. Visible Signs of ...

  3. Low-Income Home Energy Assistance Program - Wikipedia

    en.wikipedia.org/wiki/Low-Income_Home_Energy...

    In total since 1976, weatherization assisted over 7 million low-income households, which received free home improvements worth an average of about $5,000. The most common measures were furnace replacement, attic and wall insulation, and infiltration reduction.

  4. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    Institutional heating systems (office buildings or schools, for example) can use low-grade, inexpensive bunker fuel to run their heating plants, but capital cost is high compared to more easily managed liquid fuels. Natural gas is a widespread heating fuel in North America and northern Europe. Gas burners are automatically controlled and ...

  5. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    In some areas electrical resistance heating is used, especially where the cost of electricity is low or the primary purpose is for air conditioning. Modern high-efficiency furnaces can be up to 98% efficient and operate without a chimney, with a typical gas furnace being about 80% efficient. [1]

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  7. Heating, ventilation, and air conditioning - Wikipedia

    en.wikipedia.org/wiki/Heating,_ventilation,_and...

    Air handling unit, used for heating, cooling, and filtering the air. Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments ...

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